It's an...

Obsession. And it's education. And it is now past 1:30 a.m. and I am still viewing it. It is Pete's Pond.

Thank you, Poppins Classical.

this added later: A and I watched what was an initial empty pond, evening NYC time, early morning Botswana time. Suddenly, a group of elephants were all there, quietly having a drink. They left. A herd of kudu arrived. Then they left. Then some type of fat bird (an African turkey? what is that? it's not on the species list!!) wandered by for a drink. Then some impala, then some wildebeest...

Then this observation from A: "One herd leaves then a different species comes after that...It's like they all have a schedule there."

Indeed.